<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background-color: #000
        }
        .box{
            width: 500px;
            height: 500px;
            /*background: radial-gradient(red,green,blue);*/
            /*background: radial-gradient(circle,red,green,blue);*/
            background: radial-gradient(circle closest-corner at center,rgb(235, 18, 18),rgb(193, 86, 202),rgb(191, 201, 52));
            /* background: radial-gradient(circle farthest-corner at 50% 50%,red,green,blue); */
            /* background: radial-gradient(circle  farthest-side at 25% 75%,red,green,blue); */
        }
        .box1{
            width: 220px;
            height: 250px;
            margin: 0 auto;
            border-radius: 50%;
            border: 1px solid pink transparent;
            background: radial-gradient( ellipse at 175px 35px, rgba(217, 224, 184, 0.774),rgba(207, 197, 107, 0.514) 50%,rgba(221, 226, 173, 0.596));
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <div class="box1"></div>
</body>
</html>